Merge branch 'linux-2.6.31.y' of git://git.kernel.org/pub/scm/linux/kernel/git/inaky...
[linux-2.6] / net / mac80211 / mesh_plink.c
1 /*
2  * Copyright (c) 2008 open80211s Ltd.
3  * Author:     Luis Carlos Cobo <luisca@cozybit.com>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  */
9 #include <linux/kernel.h>
10 #include <linux/random.h>
11 #include "ieee80211_i.h"
12 #include "rate.h"
13 #include "mesh.h"
14
15 #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG
16 #define mpl_dbg(fmt, args...)   printk(KERN_DEBUG fmt, ##args)
17 #else
18 #define mpl_dbg(fmt, args...)   do { (void)(0); } while (0)
19 #endif
20
21 #define PLINK_GET_FRAME_SUBTYPE(p) (p)
22 #define PLINK_GET_LLID(p) (p + 1)
23 #define PLINK_GET_PLID(p) (p + 3)
24
25 #define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
26                                 jiffies + HZ * t / 1000))
27
28 /* Peer link cancel reasons, all subject to ANA approval */
29 #define MESH_LINK_CANCELLED                     2
30 #define MESH_MAX_NEIGHBORS                      3
31 #define MESH_CAPABILITY_POLICY_VIOLATION        4
32 #define MESH_CLOSE_RCVD                         5
33 #define MESH_MAX_RETRIES                        6
34 #define MESH_CONFIRM_TIMEOUT                    7
35 #define MESH_SECURITY_ROLE_NEGOTIATION_DIFFERS  8
36 #define MESH_SECURITY_AUTHENTICATION_IMPOSSIBLE 9
37 #define MESH_SECURITY_FAILED_VERIFICATION       10
38
39 #define dot11MeshMaxRetries(s) (s->u.mesh.mshcfg.dot11MeshMaxRetries)
40 #define dot11MeshRetryTimeout(s) (s->u.mesh.mshcfg.dot11MeshRetryTimeout)
41 #define dot11MeshConfirmTimeout(s) (s->u.mesh.mshcfg.dot11MeshConfirmTimeout)
42 #define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout)
43 #define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks)
44
45 enum plink_frame_type {
46         PLINK_OPEN = 0,
47         PLINK_CONFIRM,
48         PLINK_CLOSE
49 };
50
51 enum plink_event {
52         PLINK_UNDEFINED,
53         OPN_ACPT,
54         OPN_RJCT,
55         OPN_IGNR,
56         CNF_ACPT,
57         CNF_RJCT,
58         CNF_IGNR,
59         CLS_ACPT,
60         CLS_IGNR
61 };
62
63 static inline
64 void mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
65 {
66         atomic_inc(&sdata->u.mesh.mshstats.estab_plinks);
67         mesh_accept_plinks_update(sdata);
68 }
69
70 static inline
71 void mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
72 {
73         atomic_dec(&sdata->u.mesh.mshstats.estab_plinks);
74         mesh_accept_plinks_update(sdata);
75 }
76
77 /**
78  * mesh_plink_fsm_restart - restart a mesh peer link finite state machine
79  *
80  * @sta: mes peer link to restart
81  *
82  * Locking: this function must be called holding sta->lock
83  */
84 static inline void mesh_plink_fsm_restart(struct sta_info *sta)
85 {
86         sta->plink_state = PLINK_LISTEN;
87         sta->llid = sta->plid = sta->reason = 0;
88         sta->plink_retries = 0;
89 }
90
91 /*
92  * NOTE: This is just an alias for sta_info_alloc(), see notes
93  *       on it in the lifecycle management section!
94  */
95 static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
96                                          u8 *hw_addr, u32 rates)
97 {
98         struct ieee80211_local *local = sdata->local;
99         struct sta_info *sta;
100
101         if (local->num_sta >= MESH_MAX_PLINKS)
102                 return NULL;
103
104         sta = sta_info_alloc(sdata, hw_addr, GFP_ATOMIC);
105         if (!sta)
106                 return NULL;
107
108         sta->flags = WLAN_STA_AUTHORIZED;
109         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
110         rate_control_rate_init(sta);
111
112         return sta;
113 }
114
115 /**
116  * mesh_plink_deactivate - deactivate mesh peer link
117  *
118  * @sta: mesh peer link to deactivate
119  *
120  * All mesh paths with this peer as next hop will be flushed
121  *
122  * Locking: the caller must hold sta->lock
123  */
124 static void __mesh_plink_deactivate(struct sta_info *sta)
125 {
126         struct ieee80211_sub_if_data *sdata = sta->sdata;
127
128         if (sta->plink_state == PLINK_ESTAB)
129                 mesh_plink_dec_estab_count(sdata);
130         sta->plink_state = PLINK_BLOCKED;
131         mesh_path_flush_by_nexthop(sta);
132 }
133
134 /**
135  * __mesh_plink_deactivate - deactivate mesh peer link
136  *
137  * @sta: mesh peer link to deactivate
138  *
139  * All mesh paths with this peer as next hop will be flushed
140  */
141 void mesh_plink_deactivate(struct sta_info *sta)
142 {
143         spin_lock_bh(&sta->lock);
144         __mesh_plink_deactivate(sta);
145         spin_unlock_bh(&sta->lock);
146 }
147
148 static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
149                 enum plink_frame_type action, u8 *da, __le16 llid, __le16 plid,
150                 __le16 reason) {
151         struct ieee80211_local *local = sdata->local;
152         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
153         struct ieee80211_mgmt *mgmt;
154         bool include_plid = false;
155         u8 *pos;
156         int ie_len;
157
158         if (!skb)
159                 return -1;
160         skb_reserve(skb, local->hw.extra_tx_headroom);
161         /* 25 is the size of the common mgmt part (24) plus the size of the
162          * common action part (1)
163          */
164         mgmt = (struct ieee80211_mgmt *)
165                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.plink_action));
166         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.plink_action));
167         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
168                                           IEEE80211_STYPE_ACTION);
169         memcpy(mgmt->da, da, ETH_ALEN);
170         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
171         /* BSSID is left zeroed, wildcard value */
172         mgmt->u.action.category = PLINK_CATEGORY;
173         mgmt->u.action.u.plink_action.action_code = action;
174
175         if (action == PLINK_CLOSE)
176                 mgmt->u.action.u.plink_action.aux = reason;
177         else {
178                 mgmt->u.action.u.plink_action.aux = cpu_to_le16(0x0);
179                 if (action == PLINK_CONFIRM) {
180                         pos = skb_put(skb, 4);
181                         /* two-byte status code followed by two-byte AID */
182                         memset(pos, 0, 4);
183                 }
184                 mesh_mgmt_ies_add(skb, sdata);
185         }
186
187         /* Add Peer Link Management element */
188         switch (action) {
189         case PLINK_OPEN:
190                 ie_len = 3;
191                 break;
192         case PLINK_CONFIRM:
193                 ie_len = 5;
194                 include_plid = true;
195                 break;
196         case PLINK_CLOSE:
197         default:
198                 if (!plid)
199                         ie_len = 5;
200                 else {
201                         ie_len = 7;
202                         include_plid = true;
203                 }
204                 break;
205         }
206
207         pos = skb_put(skb, 2 + ie_len);
208         *pos++ = WLAN_EID_PEER_LINK;
209         *pos++ = ie_len;
210         *pos++ = action;
211         memcpy(pos, &llid, 2);
212         if (include_plid) {
213                 pos += 2;
214                 memcpy(pos, &plid, 2);
215         }
216         if (action == PLINK_CLOSE) {
217                 pos += 2;
218                 memcpy(pos, &reason, 2);
219         }
220
221         ieee80211_tx_skb(sdata, skb, 1);
222         return 0;
223 }
224
225 void mesh_neighbour_update(u8 *hw_addr, u32 rates, struct ieee80211_sub_if_data *sdata,
226                            bool peer_accepting_plinks)
227 {
228         struct ieee80211_local *local = sdata->local;
229         struct sta_info *sta;
230
231         rcu_read_lock();
232
233         sta = sta_info_get(local, hw_addr);
234         if (!sta) {
235                 sta = mesh_plink_alloc(sdata, hw_addr, rates);
236                 if (!sta) {
237                         rcu_read_unlock();
238                         return;
239                 }
240                 if (sta_info_insert(sta)) {
241                         rcu_read_unlock();
242                         return;
243                 }
244         }
245
246         sta->last_rx = jiffies;
247         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
248         if (peer_accepting_plinks && sta->plink_state == PLINK_LISTEN &&
249                         sdata->u.mesh.accepting_plinks &&
250                         sdata->u.mesh.mshcfg.auto_open_plinks)
251                 mesh_plink_open(sta);
252
253         rcu_read_unlock();
254 }
255
256 static void mesh_plink_timer(unsigned long data)
257 {
258         struct sta_info *sta;
259         __le16 llid, plid, reason;
260         struct ieee80211_sub_if_data *sdata;
261
262         /*
263          * This STA is valid because sta_info_destroy() will
264          * del_timer_sync() this timer after having made sure
265          * it cannot be readded (by deleting the plink.)
266          */
267         sta = (struct sta_info *) data;
268
269         if (sta->sdata->local->quiescing) {
270                 sta->plink_timer_was_running = true;
271                 return;
272         }
273
274         spin_lock_bh(&sta->lock);
275         if (sta->ignore_plink_timer) {
276                 sta->ignore_plink_timer = false;
277                 spin_unlock_bh(&sta->lock);
278                 return;
279         }
280         mpl_dbg("Mesh plink timer for %pM fired on state %d\n",
281                 sta->sta.addr, sta->plink_state);
282         reason = 0;
283         llid = sta->llid;
284         plid = sta->plid;
285         sdata = sta->sdata;
286
287         switch (sta->plink_state) {
288         case PLINK_OPN_RCVD:
289         case PLINK_OPN_SNT:
290                 /* retry timer */
291                 if (sta->plink_retries < dot11MeshMaxRetries(sdata)) {
292                         u32 rand;
293                         mpl_dbg("Mesh plink for %pM (retry, timeout): %d %d\n",
294                                 sta->sta.addr, sta->plink_retries,
295                                 sta->plink_timeout);
296                         get_random_bytes(&rand, sizeof(u32));
297                         sta->plink_timeout = sta->plink_timeout +
298                                              rand % sta->plink_timeout;
299                         ++sta->plink_retries;
300                         mod_plink_timer(sta, sta->plink_timeout);
301                         spin_unlock_bh(&sta->lock);
302                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
303                                             0, 0);
304                         break;
305                 }
306                 reason = cpu_to_le16(MESH_MAX_RETRIES);
307                 /* fall through on else */
308         case PLINK_CNF_RCVD:
309                 /* confirm timer */
310                 if (!reason)
311                         reason = cpu_to_le16(MESH_CONFIRM_TIMEOUT);
312                 sta->plink_state = PLINK_HOLDING;
313                 mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
314                 spin_unlock_bh(&sta->lock);
315                 mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid,
316                                     reason);
317                 break;
318         case PLINK_HOLDING:
319                 /* holding timer */
320                 del_timer(&sta->plink_timer);
321                 mesh_plink_fsm_restart(sta);
322                 spin_unlock_bh(&sta->lock);
323                 break;
324         default:
325                 spin_unlock_bh(&sta->lock);
326                 break;
327         }
328 }
329
330 #ifdef CONFIG_PM
331 void mesh_plink_quiesce(struct sta_info *sta)
332 {
333         if (del_timer_sync(&sta->plink_timer))
334                 sta->plink_timer_was_running = true;
335 }
336
337 void mesh_plink_restart(struct sta_info *sta)
338 {
339         if (sta->plink_timer_was_running) {
340                 add_timer(&sta->plink_timer);
341                 sta->plink_timer_was_running = false;
342         }
343 }
344 #endif
345
346 static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
347 {
348         sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
349         sta->plink_timer.data = (unsigned long) sta;
350         sta->plink_timer.function = mesh_plink_timer;
351         sta->plink_timeout = timeout;
352         add_timer(&sta->plink_timer);
353 }
354
355 int mesh_plink_open(struct sta_info *sta)
356 {
357         __le16 llid;
358         struct ieee80211_sub_if_data *sdata = sta->sdata;
359
360         spin_lock_bh(&sta->lock);
361         get_random_bytes(&llid, 2);
362         sta->llid = llid;
363         if (sta->plink_state != PLINK_LISTEN) {
364                 spin_unlock_bh(&sta->lock);
365                 return -EBUSY;
366         }
367         sta->plink_state = PLINK_OPN_SNT;
368         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
369         spin_unlock_bh(&sta->lock);
370         mpl_dbg("Mesh plink: starting establishment with %pM\n",
371                 sta->sta.addr);
372
373         return mesh_plink_frame_tx(sdata, PLINK_OPEN,
374                                    sta->sta.addr, llid, 0, 0);
375 }
376
377 void mesh_plink_block(struct sta_info *sta)
378 {
379         spin_lock_bh(&sta->lock);
380         __mesh_plink_deactivate(sta);
381         sta->plink_state = PLINK_BLOCKED;
382         spin_unlock_bh(&sta->lock);
383 }
384
385
386 void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
387                          size_t len, struct ieee80211_rx_status *rx_status)
388 {
389         struct ieee80211_local *local = sdata->local;
390         struct ieee802_11_elems elems;
391         struct sta_info *sta;
392         enum plink_event event;
393         enum plink_frame_type ftype;
394         size_t baselen;
395         u8 ie_len;
396         u8 *baseaddr;
397         __le16 plid, llid, reason;
398
399         /* need action_code, aux */
400         if (len < IEEE80211_MIN_ACTION_SIZE + 3)
401                 return;
402
403         if (is_multicast_ether_addr(mgmt->da)) {
404                 mpl_dbg("Mesh plink: ignore frame from multicast address");
405                 return;
406         }
407
408         baseaddr = mgmt->u.action.u.plink_action.variable;
409         baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt;
410         if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) {
411                 baseaddr += 4;
412                 baselen -= 4;
413         }
414         ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
415         if (!elems.peer_link) {
416                 mpl_dbg("Mesh plink: missing necessary peer link ie\n");
417                 return;
418         }
419
420         ftype = *((u8 *)PLINK_GET_FRAME_SUBTYPE(elems.peer_link));
421         ie_len = elems.peer_link_len;
422         if ((ftype == PLINK_OPEN && ie_len != 3) ||
423             (ftype == PLINK_CONFIRM && ie_len != 5) ||
424             (ftype == PLINK_CLOSE && ie_len != 5 && ie_len != 7)) {
425                 mpl_dbg("Mesh plink: incorrect plink ie length\n");
426                 return;
427         }
428
429         if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) {
430                 mpl_dbg("Mesh plink: missing necessary ie\n");
431                 return;
432         }
433         /* Note the lines below are correct, the llid in the frame is the plid
434          * from the point of view of this host.
435          */
436         memcpy(&plid, PLINK_GET_LLID(elems.peer_link), 2);
437         if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 7))
438                 memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2);
439
440         rcu_read_lock();
441
442         sta = sta_info_get(local, mgmt->sa);
443         if (!sta && ftype != PLINK_OPEN) {
444                 mpl_dbg("Mesh plink: cls or cnf from unknown peer\n");
445                 rcu_read_unlock();
446                 return;
447         }
448
449         if (sta && sta->plink_state == PLINK_BLOCKED) {
450                 rcu_read_unlock();
451                 return;
452         }
453
454         /* Now we will figure out the appropriate event... */
455         event = PLINK_UNDEFINED;
456         if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) {
457                 switch (ftype) {
458                 case PLINK_OPEN:
459                         event = OPN_RJCT;
460                         break;
461                 case PLINK_CONFIRM:
462                         event = CNF_RJCT;
463                         break;
464                 case PLINK_CLOSE:
465                         /* avoid warning */
466                         break;
467                 }
468                 spin_lock_bh(&sta->lock);
469         } else if (!sta) {
470                 /* ftype == PLINK_OPEN */
471                 u32 rates;
472                 if (!mesh_plink_free_count(sdata)) {
473                         mpl_dbg("Mesh plink error: no more free plinks\n");
474                         rcu_read_unlock();
475                         return;
476                 }
477
478                 rates = ieee80211_sta_get_rates(local, &elems, rx_status->band);
479                 sta = mesh_plink_alloc(sdata, mgmt->sa, rates);
480                 if (!sta) {
481                         mpl_dbg("Mesh plink error: plink table full\n");
482                         rcu_read_unlock();
483                         return;
484                 }
485                 if (sta_info_insert(sta)) {
486                         rcu_read_unlock();
487                         return;
488                 }
489                 event = OPN_ACPT;
490                 spin_lock_bh(&sta->lock);
491         } else {
492                 spin_lock_bh(&sta->lock);
493                 switch (ftype) {
494                 case PLINK_OPEN:
495                         if (!mesh_plink_free_count(sdata) ||
496                             (sta->plid && sta->plid != plid))
497                                 event = OPN_IGNR;
498                         else
499                                 event = OPN_ACPT;
500                         break;
501                 case PLINK_CONFIRM:
502                         if (!mesh_plink_free_count(sdata) ||
503                             (sta->llid != llid || sta->plid != plid))
504                                 event = CNF_IGNR;
505                         else
506                                 event = CNF_ACPT;
507                         break;
508                 case PLINK_CLOSE:
509                         if (sta->plink_state == PLINK_ESTAB)
510                                 /* Do not check for llid or plid. This does not
511                                  * follow the standard but since multiple plinks
512                                  * per sta are not supported, it is necessary in
513                                  * order to avoid a livelock when MP A sees an
514                                  * establish peer link to MP B but MP B does not
515                                  * see it. This can be caused by a timeout in
516                                  * B's peer link establishment or B beign
517                                  * restarted.
518                                  */
519                                 event = CLS_ACPT;
520                         else if (sta->plid != plid)
521                                 event = CLS_IGNR;
522                         else if (ie_len == 7 && sta->llid != llid)
523                                 event = CLS_IGNR;
524                         else
525                                 event = CLS_ACPT;
526                         break;
527                 default:
528                         mpl_dbg("Mesh plink: unknown frame subtype\n");
529                         spin_unlock_bh(&sta->lock);
530                         rcu_read_unlock();
531                         return;
532                 }
533         }
534
535         mpl_dbg("Mesh plink (peer, state, llid, plid, event): %pM %d %d %d %d\n",
536                 mgmt->sa, sta->plink_state,
537                 le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
538                 event);
539         reason = 0;
540         switch (sta->plink_state) {
541                 /* spin_unlock as soon as state is updated at each case */
542         case PLINK_LISTEN:
543                 switch (event) {
544                 case CLS_ACPT:
545                         mesh_plink_fsm_restart(sta);
546                         spin_unlock_bh(&sta->lock);
547                         break;
548                 case OPN_ACPT:
549                         sta->plink_state = PLINK_OPN_RCVD;
550                         sta->plid = plid;
551                         get_random_bytes(&llid, 2);
552                         sta->llid = llid;
553                         mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata));
554                         spin_unlock_bh(&sta->lock);
555                         mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid,
556                                             0, 0);
557                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr,
558                                             llid, plid, 0);
559                         break;
560                 default:
561                         spin_unlock_bh(&sta->lock);
562                         break;
563                 }
564                 break;
565
566         case PLINK_OPN_SNT:
567                 switch (event) {
568                 case OPN_RJCT:
569                 case CNF_RJCT:
570                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
571                 case CLS_ACPT:
572                         if (!reason)
573                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
574                         sta->reason = reason;
575                         sta->plink_state = PLINK_HOLDING;
576                         if (!mod_plink_timer(sta,
577                                              dot11MeshHoldingTimeout(sdata)))
578                                 sta->ignore_plink_timer = true;
579
580                         llid = sta->llid;
581                         spin_unlock_bh(&sta->lock);
582                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
583                                             plid, reason);
584                         break;
585                 case OPN_ACPT:
586                         /* retry timer is left untouched */
587                         sta->plink_state = PLINK_OPN_RCVD;
588                         sta->plid = plid;
589                         llid = sta->llid;
590                         spin_unlock_bh(&sta->lock);
591                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
592                                             plid, 0);
593                         break;
594                 case CNF_ACPT:
595                         sta->plink_state = PLINK_CNF_RCVD;
596                         if (!mod_plink_timer(sta,
597                                              dot11MeshConfirmTimeout(sdata)))
598                                 sta->ignore_plink_timer = true;
599
600                         spin_unlock_bh(&sta->lock);
601                         break;
602                 default:
603                         spin_unlock_bh(&sta->lock);
604                         break;
605                 }
606                 break;
607
608         case PLINK_OPN_RCVD:
609                 switch (event) {
610                 case OPN_RJCT:
611                 case CNF_RJCT:
612                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
613                 case CLS_ACPT:
614                         if (!reason)
615                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
616                         sta->reason = reason;
617                         sta->plink_state = PLINK_HOLDING;
618                         if (!mod_plink_timer(sta,
619                                              dot11MeshHoldingTimeout(sdata)))
620                                 sta->ignore_plink_timer = true;
621
622                         llid = sta->llid;
623                         spin_unlock_bh(&sta->lock);
624                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
625                                             plid, reason);
626                         break;
627                 case OPN_ACPT:
628                         llid = sta->llid;
629                         spin_unlock_bh(&sta->lock);
630                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
631                                             plid, 0);
632                         break;
633                 case CNF_ACPT:
634                         del_timer(&sta->plink_timer);
635                         sta->plink_state = PLINK_ESTAB;
636                         mesh_plink_inc_estab_count(sdata);
637                         spin_unlock_bh(&sta->lock);
638                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
639                                 sta->sta.addr);
640                         break;
641                 default:
642                         spin_unlock_bh(&sta->lock);
643                         break;
644                 }
645                 break;
646
647         case PLINK_CNF_RCVD:
648                 switch (event) {
649                 case OPN_RJCT:
650                 case CNF_RJCT:
651                         reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION);
652                 case CLS_ACPT:
653                         if (!reason)
654                                 reason = cpu_to_le16(MESH_CLOSE_RCVD);
655                         sta->reason = reason;
656                         sta->plink_state = PLINK_HOLDING;
657                         if (!mod_plink_timer(sta,
658                                              dot11MeshHoldingTimeout(sdata)))
659                                 sta->ignore_plink_timer = true;
660
661                         llid = sta->llid;
662                         spin_unlock_bh(&sta->lock);
663                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
664                                             plid, reason);
665                         break;
666                 case OPN_ACPT:
667                         del_timer(&sta->plink_timer);
668                         sta->plink_state = PLINK_ESTAB;
669                         mesh_plink_inc_estab_count(sdata);
670                         spin_unlock_bh(&sta->lock);
671                         mpl_dbg("Mesh plink with %pM ESTABLISHED\n",
672                                 sta->sta.addr);
673                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
674                                             plid, 0);
675                         break;
676                 default:
677                         spin_unlock_bh(&sta->lock);
678                         break;
679                 }
680                 break;
681
682         case PLINK_ESTAB:
683                 switch (event) {
684                 case CLS_ACPT:
685                         reason = cpu_to_le16(MESH_CLOSE_RCVD);
686                         sta->reason = reason;
687                         __mesh_plink_deactivate(sta);
688                         sta->plink_state = PLINK_HOLDING;
689                         llid = sta->llid;
690                         mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata));
691                         spin_unlock_bh(&sta->lock);
692                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid,
693                                             plid, reason);
694                         break;
695                 case OPN_ACPT:
696                         llid = sta->llid;
697                         spin_unlock_bh(&sta->lock);
698                         mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid,
699                                             plid, 0);
700                         break;
701                 default:
702                         spin_unlock_bh(&sta->lock);
703                         break;
704                 }
705                 break;
706         case PLINK_HOLDING:
707                 switch (event) {
708                 case CLS_ACPT:
709                         if (del_timer(&sta->plink_timer))
710                                 sta->ignore_plink_timer = 1;
711                         mesh_plink_fsm_restart(sta);
712                         spin_unlock_bh(&sta->lock);
713                         break;
714                 case OPN_ACPT:
715                 case CNF_ACPT:
716                 case OPN_RJCT:
717                 case CNF_RJCT:
718                         llid = sta->llid;
719                         reason = sta->reason;
720                         spin_unlock_bh(&sta->lock);
721                         mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr,
722                                             llid, plid, reason);
723                         break;
724                 default:
725                         spin_unlock_bh(&sta->lock);
726                 }
727                 break;
728         default:
729                 /* should not get here, PLINK_BLOCKED is dealt with at the
730                  * beggining of the function
731                  */
732                 spin_unlock_bh(&sta->lock);
733                 break;
734         }
735
736         rcu_read_unlock();
737 }